JP4037398B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving table lifting device provided in a lower rear portion of a freight vehicle, and more specifically, a load receiving table provided in a lower lower portion of a freight vehicle and a lifting drive unit thereof in a longitudinal direction of the freight vehicle. The present invention relates to a load receiving table lifting device having a load receiving table slide portion to be moved.

  In a freight vehicle, in order to support the work of loading the cargo on the loading platform installed in the vehicle and unloading the cargo on the loading platform to the ground, platform, etc. A loading cradle that is unfolded from the folded state, a lifting mechanism that moves the loading cradle up and down between the ground and the height of the cargo bed floor of the cargo vehicle, and the folded cradle on the vehicle side or after It is equipped with a cargo receiving platform lifting / lowering device comprising a moving mechanism for moving it toward the direction.

  The moving mechanism described above includes a guide rail provided at the lower rear portion of the vehicle, and a moving body having a roller that moves along the guide rail (see, for example, Patent Document 1).

JP 2003-25900 A

  The moving mechanism that moves the load receiving table in the longitudinal direction of the vehicle described above will cause the load receiving table to move in the width direction when the load receiving table is moved in the longitudinal direction of the vehicle unless the roller assembly with respect to the guide rail is adjusted accurately. This may result in an unbalanced state, which may hinder the smooth movement of the load receiving platform, and may impair the stability of loading and unloading operations.

  Moreover, when a roller and its support bearing etc. are worn out over time, parts such as the roller must be replaced, and the operation of the freight vehicle must be stopped by the replacement work. As a result, a freight vehicle alternative arrangement work or the like is required, and there may be a problem that the load transfer efficiency is lowered.

  Since the present invention has been made based on the above-described matters, it provides a load receiving platform lifting device that can smoothly move the load receiving platform and its lifting drive unit in the front-rear direction of the freight vehicle and that can be easily adjusted. For the purpose.

In order to achieve the above object, the present invention provides a load receiving platform lifting / lowering device in which a folded load receiving platform (7) and its lifting / lowering driving portion (8) are movable in the front-rear direction at the lower rear portion of the cargo vehicle. , A guide rail (14) that is arranged in parallel at the lower rear of the vehicle and includes an upper guide portion (49), a lower guide portion (50), and a side guide portion (51) provided therebetween, and each guide rail ( 14) provided on the rear upper part of the vehicle of the outer frame (52), the inner frame (53), the outer frame (52) and the inner frame (53) facing the side part of the vehicle, The upper frame body (54) facing the upper surface of the guide section (49), the outer frame body (52), and the inner frame body (53) are provided at the lower part on the front side of the vehicle, and the lower guide section (49) A lower frame (55) facing the lower surface, and the load receiving platform (7) and its elevation drive unit ( ), An upper slide body (56) provided inside the upper frame (54) of the slider (15), and an inner side of the lower frame (55) of the slider (15). A first slide body (58) slidably in contact with the outer upper surface of the side guide portion (51) and the lower surface of the upper guide portion (49) of the guide rail (14), and the guide A second slide body (59) slidably in contact with the lower outer surface of the side guide portion (51) and the upper surface of the lower guide portion (50) of the rail (14); and the outer side of the side guide portion (51) of the guide rail (14). A first guide body that is provided on the inner surface of the rear upper portion of the vehicle in the outer frame body (52) of the slider (15) so as to face the upper side surface and guides the lower surface of the first slide body (58). (61) and first slide body (58) side The guide means (63) on the rear side of the vehicle composed of the second guide body (62) for guiding the vehicle and the outer lower side surface of the side guide portion (51) of the guide rail (14) A first guide body (61) and a second slide body which are provided on the inner surface of the lower part of the front side of the vehicle in the outer frame body (52) of the slider (15) and guide the upper surface of the second slide body (59). (59) a front guide means (63) comprising a second guide body (62) for guiding a side surface of the vehicle (59), and a pushing means for the first and second slide bodies (58, 59) ( 65, 66).

  According to the load receiving platform lifting apparatus of the present invention, the load receiving platform and its lifting drive unit can be smoothly moved in the front-rear direction of the freight vehicle, and its movement adjustment is easy, so that its maintainability can be improved. it can. Also, for example, rattling adjustment work that occurs due to aging can be adjusted at the site without having to transport the vehicle to a repair shop for repair. It is shortened and the operating efficiency can be increased.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a cargo receiving platform lifting apparatus of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an overall configuration of an example of a freight vehicle provided with an embodiment of a cargo receiving platform lifting apparatus of the present invention. In this figure, reference numeral 1 denotes a freight vehicle. The freight vehicle 1 has a space for storing a load on a vehicle frame 4 behind a cab 3 constituting the chassis 2 in this example, and an open / close door 5 at the rear. A cargo bed 6 having

  In the lower rear part of the cargo vehicle 1 described above, a cargo receiving platform lifting device 100 is installed. The load receiving platform elevating device 100 folds the load receiving stand 7 during storage or the like and stores (accommodates) the load receiving platform 7 in the lower portion of the car frame 4. The load receiving platform 7 is moved up and down between the floor surface of the loading platform 6 and the ground to assist the loading and unloading of luggage and workers on the loading platform 6 according to the work.

  The load receiving platform lifting / lowering apparatus 100 includes a load receiving platform 7, a load receiving platform lifting / lowering drive unit 8 that lifts and lowers the load receiving platform 7 with respect to the vehicle frame 4, and the load receiving platform 7 and the load receiving platform lifting / lowering drive unit 8. It is comprised by the load receiving slide part 9 to which it moves back and forth in the rear part, its power source, an operation part, etc.

  A detailed configuration of the load receiving table lifting / lowering device 100 including the load receiving table 7, the load receiving table lifting / lowering drive unit 8 and the load receiving table slide unit 9 will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view showing a detailed configuration of an embodiment of the load receiving table lifting / lowering device 100 including the load receiving table 7, the load receiving table lifting / lowering drive unit 8 and the load receiving table sliding unit 9, and FIG. 3 is a side view thereof. is there. In these figures, the same reference numerals as those in FIG. 1 denote the same parts.

  In these drawings, first, the structure of the cargo receiving slide 9 will be described. Reference numerals 10 and 10 denote front brackets fixed by bolts or the like at two locations in the front width direction of the vehicle 1 at the lower rear side of the vehicle frame 4; Reference numeral 11 denotes a rear bracket fixed by bolts or the like at two locations in the rear width direction of the vehicle 1 at the lower rear side of the vehicle frame 4, and 12 denotes a reinforcing beam provided between the front brackets 10 and 10. Reference numerals 13 denote support plates fixed to the lower portions of the front brackets 10 and 10, respectively.

  Reference numerals 14 and 14 are guide rails provided between the front bracket 10 and the rear bracket 11, respectively. These guide rails 14 and 14 extend along the front-rear direction of the vehicle 1 at two locations in the width direction (left and right) of the vehicle 1. Are arranged almost horizontally. The guide rail 14 is made of, for example, H-shaped steel.

  Reference numeral 15 denotes a slider provided so as to be movable along each guide rail 14, and the slider 15 is a slide pad that slides on the surface of the guide rail 14 so as to sandwich the guide rail 14 having an H-shaped cross section (or a U-shaped cross section). And a frame that supports the slide pad.

  Reference numeral 16 denotes a beam provided between the sliders 15, 17 denotes a support member for attaching a support roller provided at an interval in the width direction of the vehicle 1 so that the front end protrudes rearward of the vehicle, and 18 is rotatable to the front end of the support member 17. The support roller 18 supports the load receiving table 7 during storage and guides the operation of the load receiving table 7 when the load receiving table 7 is stored or deployed. Reference numeral 19 denotes a cylinder for operating the slider 15. The cylinder body is housed and fixed in the support member 17, and the tip of the piston rod is connected to the support plate 13 by a pin 20.

  Next, the configuration of the load receiving table elevating drive unit 8 will be described with reference to FIGS. 2 and 3. Reference numeral 21 denotes an inner base end frame, and the inner base end frame 21 is positioned outside the sliders 15. It is fixed to each. Reference numeral 22 denotes an outer proximal frame, and the outer proximal frame 22 is fixed to the beam 16 so as to be located outside the inner proximal frames 21. Reference numeral 23 denotes a first arm, and one end of the first arm 23 is rotatably connected to the inner base frame 21 by a pin 24. Reference numeral 25 denotes a second arm (lift arm). One end of the second arm 25 is connected to the first arm 23 by a pin 26, and the other end is connected to the base side of the load receiving platform 7 by a pin 27. Reference numeral 28 denotes a third arm (compression arm). One end of the third arm 28 is connected to the outer base end frame 22 by a pin 29, and the other end is connected to the base side of the load receiving platform 7 by a pin 30. 31 is a cylinder for operating the second arm 25. The base end of the cylinder body of the cylinder 31 is connected to the second arm 25 by a pin 32, and its piston rod is connected to the other end of the first arm 23 by a pin 33. Yes.

  Reference numeral 34 denotes a stopper bolt that defines a lower limit angle of the rotation range of the second arm 25, and the stopper bolt 34 has a lower end of the first arm 23 so as to contact a stopper portion 35 provided at the lower end portion of the inner base end frame 21. Provided in the department.

  At this time, in FIG. 3, since the base of the load receiving platform 7 is grounded and the cylinder 31 is further retracted, the first arm 23 is pulled toward the base of the load receiving platform 7 by the cylinder 31, and the first arm 23 is moved to the second position. The angle formed with respect to the arm 25 is small, and the base of the load receiving platform 7 is inclined downward in the downward direction. However, in the state where the cylinder 31 is extended from the state of FIG. 3 and the stopper bolt 34 of the first arm 23 is in contact with the stopper portion 35 of the inner proximal frame 21, the second and third arms 25, 28 described above. Since the arrangement of the pins 26, 27, 29, and 30 constitutes the positional relationship of the apexes of the parallelogram, the upper surface of the load receiving platform 7 moves up and down while the second arm 25 is rotated by the cylinder 31. It is like that.

  A stopper bolt 36 defines an upper limit angle of the rotation range of the second arm 25. The stopper bolt 36 is arranged so that a stopper portion 37 provided in the vicinity of the proximal end portion of the second arm 25 is in contact with the inner base frame 21. Is provided at the upper end.

  Reference numeral 38 denotes a power unit. The power unit 38 is attached to one end of the beam 16 so as to be positioned on the side of the lower end of the rear end of the vehicle frame 4 in the freight vehicle 1 as shown in FIG. The power unit 38 includes a hydraulic pump and a plurality of control valves that switch and supply the pressure oil discharged from the hydraulic pump to the cylinder 19 for operating the slider 15 and the cylinder 31 for operating the second arm 25, respectively. At least built-in. The hydraulic pump is driven by power supplied from, for example, a generator or a battery of the freight vehicle 1.

  Reference numeral 39 denotes an operation unit, and the operation unit 39 is attached to the other end of the beam 16 so as to be located on the side of the lower end of the rear end of the vehicle frame 4 in the freight vehicle 1 as shown in FIG. By operating the operation button in the operation unit 39, an expansion / contraction operation signal is output to the power unit 38 to the cylinder 19 for operating the slider 15 and the cylinder 31 for operating the second arm 25.

  As shown in FIG. 2, the support member 17 of the support roller 18 is provided with a storage position sensor 40 that detects whether or not the tip end side of the folded load receiving platform 7 is in contact with the support roller 18. Yes. The storage position sensor 40 outputs this detection signal to a control device (not shown) when it is detected that the load receiving platform 7 is in contact with the support roller 18. As a result, the control device controls the power unit 38, and when the folded load receiving platform 7 is in a substantially horizontal state, the operation of the slider 15 is performed without further extending the operation cylinder 31 of the second arm 25. The cylinder 19 for operation of the slider 15 and the cylinder 31 for operation of the second arm 25 are interlocked and controlled so that the cylinder 19 for operation is retracted and the load receiving platform 7 is retracted and stored in the lower part of the vehicle frame 4.

  Next, the structure of the load receiving table 7 will be described. The load receiving table 7 includes a first load receiving member 41 on the vehicle side, and a second load receiving member connected to the first load receiving member 41 by a hinge 42. 43 and a third load receiving member 45 connected to the second load receiving member 43 by means of a hinge 44. When the freight vehicle 1 is traveling, As shown in FIG. 2 and FIG. 3, the stoppers 46 and 47 are brought into contact with each other so that a load or a cart with a caster can be mounted when loading / unloading the load. It is unfolded so that the receiving surface side is flat.

  Reference numeral 48 denotes a stopper device provided on the third load receiving member 45 located on the front end side of the load receiving table 7 so as to be able to be raised and lowered. This stopper device 48 has casters, wheels, etc. provided on the cart to the rear of the freight vehicle. This prevents movement and prevents the cart from slipping off from the load receiving platform 7.

  A detailed configuration of the above-described cargo receiving slide portion 9 will be described with reference to FIGS. 4 is a plan view of the load receiving slide 9, FIG. 5 is a side view of the load receiving slide 9 as seen from the VV arrow in FIG. 4, and FIG. 6 is a load receiving slide from the VI-VI arrow in FIG. 9 is a longitudinal sectional view of FIG. 7, and FIG. 7 is a transverse sectional view of the load receiving slide 9 viewed from the direction of arrows VII-VII in FIG. 6. In these drawings, the same reference numerals as those shown in FIGS. Things are the same part.

  As shown in FIG. 6, the guide rails 14 and 14 arranged side by side are provided between the upper guide portion 49, the lower guide portion 50, and the guide portions 49 and 50, respectively, as shown in FIG. The side guide part 51 is comprised.

  As shown in FIG. 6, the slider 15 includes an outer frame body 52 positioned outside each guide rail 14, an inner frame body 53 positioned inside each guide rail 14, an outer frame body 52, and an inner frame body. 53 is provided with an upper frame 54 provided on the upper side of 53 and a lower frame 55 provided on the lower side of the outer frame 52 and the inner frame 53. As shown in FIG. 5, the upper frame 54 is disposed on the rear side (right side in FIG. 5) of the freight vehicle 1, and the lower frame 55 is disposed on the front side (left side in FIG. 5).

  Further, as shown in FIG. 6, the slider 15 includes an upper slide body 56 provided on the upper frame 54 so as to be in sliding contact with the upper surface of the upper guide portion 49 of the guide rail 14, and the lower surface of the lower guide portion 50 of the guide rail 14. A lower slide body 57 provided on the lower frame body 55 so as to be in sliding contact with the upper side, and an upper side which is a first slide body in sliding contact with the outer upper side surface of the side guide portion 51 of the guide rail 14 and the lower surface of the upper guide portion 49. A horizontal slide body 58, and a lower horizontal slide body 59, which is a second slide body slidably in contact with the outer lower side surface of the side guide portion 51 of the guide rail 14 and the upper surface of the lower guide portion 50, are provided. As shown in FIG. 5, the upper side slide body 58 is disposed on the rear side (right side in FIG. 5), and the lower side slide body 59 is disposed on the front side (left side in FIG. 5). ing.

  As shown in FIGS. 6 and 7, the horizontal slide bodies 58 and 59 are fixed to the inner side of the outer frame body 52 with bolts 60, respectively, and first guide the lower surface of the horizontal slide body 58 or the upper surface of the horizontal slide body 59. Of the guide rails 14 by the guide means 63 composed of the guide body 61 and the second guide body 62 provided on the first guide body 61 and guiding the side surfaces of the lateral slide bodies 58 and 59, respectively. It is held so as to be movable in the direction of the side guide portion 51.

  Further, as shown in FIGS. 6 and 7, the respective back portions of the horizontal slide bodies 58 and 59 are screwed into the outer frame body 52 and are respectively brought into contact with the pressing plates 64 on the rear surfaces of the horizontal slide bodies 58 and 59. Bolts 65 and 66 are provided. By the screwing of the adjusting bolts 65 and 66, the lateral slide bodies 58 and 59 are restricted from moving in the vertical and front-rear direction by the first guide body 61 and the second guide body 62, respectively. It can move toward the side guide portion 51 of the rail 14.

  The adjustment bolt 65 has a hexagonal hole in its head in view of the work.

Next, loading and unloading operations of the load according to the embodiment of the above-described load receiving platform lifting apparatus of the present invention will be described with reference to the drawings.
As shown in FIG. 1, in order to shift from the state in which the cargo receiving platform 7 is folded and stored to the lower rear side of the freight vehicle 1 to the working state, first, a predetermined operation is performed by the operation unit 39, The piston rod of the cylinder 19 in the load receiving slide 9 is extended, the slider 15 is moved along the guide rail 14 toward the rear of the freight vehicle, and the load receiving stand 7 and the load receiving lift drive unit 8 are moved to the freight vehicle 1. Project backwards. At this time, the movement of the freight vehicle 1 in the vertical and width directions is restricted by the upper slide body 56, the lower slide body 57, and the horizontal slide bodies 58 and 59 that are in sliding contact with the guide rail 14 shown in FIGS. The cargo vehicle 1 moves smoothly to the rear.

  Next, the piston rod of the cylinder 31 in the load receiving table raising / lowering drive unit 8 is contracted, and the second arm (lift arm) 25 is rotated clockwise in FIG. 3 to ground the first load receiving member 41 of the load receiving table 7. Let During this transition operation, the load receiving platform 7 supported by the support roller 18 rolls to the support roller 18 while being folded, and gradually follows the support roller 18 from a substantially horizontal state to the freight vehicle. Stands up to the back of the car and stands up to a state where it can be easily deployed manually.

  When this state is reached, the load receiving platform 7 is unfolded. First, a grip (not shown) provided on the back surface of the second load receiving platform member 43 of the load receiving platform 7 is pulled to place the second load receiving platform member 43 in a substantially horizontal state. Expand to. Next, a grip (not shown) provided on the back surface of the third load receiving base member 45 is pulled, and the third load receiving base member 45 folded on the second load receiving base member 43 is developed in a substantially horizontal state.

  Next, the piston rod of the cylinder 31 is shrunk so that the entire load receiving table 7 is inclined downward toward the rear of the freight vehicle 1, and the tip of the third load receiving table member 45 of the load receiving table 7 is placed on the ground. Close to. Thereby, as shown in FIG.2 and FIG.3, the load receiving stand 7 is maintained in the state which can load a load with a cart etc. on the load receiving surface. In this state, after the carriage is loaded on the load receiving table 7, the fixing means of the stopper device 48 is released, and the stopper device 48 is raised and protrudes upward from the load receiving surface of the load receiving table 7. By bringing the traveling wheel of the carriage into contact with the standing stopper device 48, the carriage can be placed on the load receiving base 7 so as not to slide off the load receiving base 7.

  When the load is loaded on the load receiving platform 7, the load receiving platform lifting / lowering drive unit 8 is driven by the operation unit 39, so that the load receiving platform 7 rises to the floor surface of the load receiving platform 6 of the cargo vehicle 1 set in advance and stops. Thereby, the cart on the loading platform 7 can be carried into the loading platform 6.

  When further loading is performed after loading, the loading table 7 is lowered, the stopper device 48 is housed and fixed on the loading table 7, and the above operation is repeated to load or unload and receive the load. The table 7 can be stored.

  When the load receiving platform 7 is inclined in the width direction of the freight vehicle 1 during the above-described loading of the cargo, long-term use of the unloading work, or assembly of the load receiving platform 7 and its lifting / lowering drive unit 8, FIG. 7 can be moved and adjusted relative to the side guide portion 51 of the guide rail 14 by screwing the adjusting bolts 65 and 66 shown in FIG. The inclination of the raising / lowering drive unit 8 in the width direction of the freight vehicle 1 can be suppressed, and the movement of the freight vehicle 1 in the front-rear direction of the load receiving platform 7 and the raising / lowering drive unit 8 can be made smooth.

  In the above-described embodiment of the present invention, the upper side slide body 58 is in sliding contact with the outer upper side surface of the side guide portion 51 of the guide rail 14 and the lower surface of the upper guide portion 49, and the lower side slide body 59 is The guide rail 14 is configured to be in sliding contact with the outer lower side surface of the side guide portion 51 and the upper surface of the lower guide portion 50, but the slider 15 is guided to the guide rail 14 by the upper slide body 56 and the lower slide body 57. The horizontal slide body 58 omits the portion that makes sliding contact with the lower surface of the upper guide portion 49 of the guide rail 14, and the lower horizontal slide body 59 omits the portion that makes sliding contact with the upper surface of the lower guide portion 50 of the guide rail 14. It is also possible to do.

  According to the embodiment of the load receiving platform lifting apparatus of the present invention described above, the load receiving platform and its lifting drive unit can be smoothly moved in the front-rear direction of the freight vehicle, and its movement adjustment is also easy. Can be improved. Also, for example, rattling adjustment work that occurs due to aging can be adjusted at the site without having to transport the vehicle to a repair shop for repair. It is shortened and the operating efficiency can be increased.

It is a perspective view showing the whole structure of the cargo vehicle provided with one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is a perspective view which shows one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is a side view which shows one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is a top view which shows one Embodiment of the load receiving table slide part which comprises the load receiving stand raising / lowering apparatus of this invention. It is the side view which looked at one Embodiment of the load receiving base slide part which comprises the load receiving stand raising / lowering apparatus of this invention from the VV arrow shown in FIG. It is the expanded longitudinal cross-sectional view which looked at one Embodiment of the load receiving table slide part which comprises the load receiving stand raising / lowering apparatus of this invention from the VI-VI arrow view shown in FIG. It is the expanded cross-sectional view which looked at one Embodiment of the load receiving stand slide part which comprises the load receiving stand raising / lowering apparatus of this invention from the VII-VII arrow shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cargo vehicle 3 Driver's cab 4 Car frame 6 Loading platform 7 Loading platform 8 Loading platform lifting / lowering drive section 9 Loading platform slide section 14 Guide rail 15 Slider 56 Upper slide body 57 Lower slide body 58 Lateral slide body (first slide body)
59 Horizontal slide body (second slide body)
61 First guide body 62 Second guide body 63 Guide means 65 Adjustment bolt (pushing means)
66 Adjustment bolt (pushing means)
100 Loading platform lifting device

Claims (1)

In the load receiving platform elevating apparatus that allows the folded load receiving platform (7) and its elevating drive unit (8) to move in the front-rear direction at the rear lower part of the freight vehicle,
A guide rail (14) which is arranged in parallel at the lower rear part of the vehicle and includes an upper guide part (49), a lower guide part (50), and a side guide part (51) provided therebetween;
On the rear upper side of the vehicle, the outer frame (52), the inner frame (53), the outer frame (52) and the inner frame (53) facing the side of each guide rail (14). Provided on the lower front side of the vehicle of the upper frame (54), the outer frame (52) and the inner frame (53) facing the upper surface of the upper guide part (49), and the lower guide A lower frame (55) facing the lower surface of the portion (49), and a slider (15) for supporting the load receiving base (7) and its elevation drive unit (8),
An upper slide body (56) provided inside an upper frame (54) of the slider (15);
A lower slide body (57) provided inside a lower frame (55) of the slider (15);
A first slide body (58) slidably contacting the outer upper surface of the side guide portion (51) and the lower surface of the upper guide portion (49) of the guide rail (14);
A second slide body (59) in sliding contact with the outer lower surface of the side guide portion (51) and the upper surface of the lower guide portion (50) of the guide rail (14);
Provided on the inner surface of the rear upper part of the vehicle in the outer frame (52) of the slider (15) so as to face the outer upper surface of the side guide portion (51) of the guide rail (14), Guide means on the rear side of the vehicle comprising a first guide body (61) for guiding the lower surface of the slide body (58) and a second guide body (62) for guiding the side surface of the first slide body (58). (63)
A second inner surface of the outer frame (52) of the slider (15) is provided on the inner surface of the lower front side of the vehicle so as to face the outer lower surface of the side guide portion (51) of the guide rail (14), Guiding means on the front side of the vehicle comprising a first guide body (61) for guiding the upper surface of the slide body (59) and a second guide body (62) for guiding the side surface of the second slide body (59). (63)
A load receiving platform elevating device comprising: pushing means (65, 66) for pressing the first and second slide bodies (58, 59).

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